Journal ArticleDOI
Performance Improvement of LCL -Filter-Based Grid-Connected Inverters Using PQR Power Transformation
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TLDR
In this article, a compensation method using power theory was proposed to improve the stability of a three-phase PWM inverter with respect to the additional poles introduced by the LC part.Abstract:
The demand for three-phase pulsewidth modulation (PWM) inverters in applications such as power control or grid connecting has been on the increase in recent years. Such inverters are connected to the grid via an L filter or an LCL filter to reduce the harmonics caused by the switching. An LCL filter can reduce the harmonics induced by low switching frequency and generates a satisfactory level of grid-side current using a relatively low inductance, as compared to an L filter. The additional poles introduced by the LC part induces resonance in the system, leading to stability problems; this paper presents a compensation method using power theory to improve these issues, so that the performance of the designed LCL filter system can be improved. The effectiveness of the proposed algorithm is verified by simulations and experiments.read more
Citations
More filters
Journal ArticleDOI
Exploring inherent damping characteristic of LCL-filters for three-phase grid-connected voltage source inverters
TL;DR: In this paper, the inherent damping characteristic of LCL filters for three-phase grid-connected voltage source inverters is investigated, and a general design guideline for choosing values of grid and converter-side inductors, so that optimum damping can be achieved by solely using converter current control, doing away with active damping, passive damping or complex state observer.
Journal ArticleDOI
An LLCL Power Filter for Single-Phase Grid-Tied Inverter
TL;DR: The LLCL filter as mentioned in this paper inserts a small inductor in the branch loop of the capacitor in the traditional LCL filter to compose a series resonant circuit at the switching frequency, which attenuates the switching-frequency current ripple components much better than an LCL filtering.
Journal ArticleDOI
New Modulation Techniques for a Leakage Current Reduction and a Neutral-Point Voltage Balance in Transformerless Photovoltaic Systems Using a Three-Level Inverter
June-Seok Lee,Kyo-Beum Lee +1 more
TL;DR: In this paper, the authors proposed modulation techniques to reduce the leakage current and balance the dc-link voltages in transformerless photovoltaic (PV) systems using three-level inverter.
Journal ArticleDOI
Method for Detecting an Open-Switch Fault in a Grid-Connected NPC Inverter System
TL;DR: In this paper, a fault-detection method for an open-switch fault in the switches of grid-connected neutral-point-clamped inverter systems is proposed, which can not only detect the fault condition but also identify the location of the faulty switch.
Journal ArticleDOI
Single-Phase Inverter Control Techniques for Interfacing Renewable Energy Sources With Microgrid—Part I: Parallel-Connected Inverter Topology With Active and Reactive Power Flow Control Along With Grid Current Shaping
TL;DR: In this article, a novel current control technique is proposed to control both active and reactive power flow from a renewable energy source feeding a microgrid system through a single-phase parallel-connected inverter.
References
More filters
Journal ArticleDOI
Design and control of an LCL-filter-based three-phase active rectifier
TL;DR: In this article, a step-by-step procedure for designing the LCL filter of a front-end three-phase active rectifier is proposed to reduce the switching frequency ripple at a reasonable cost, while at the same time achieving a high-performance front end rectifier.
Book
Instantaneous power theory and applications to power conditioning
TL;DR: The p-q theory in three-phase, four-wire Shunt Active Filters as discussed by the authors has been applied to power flow control in power electronics equipment and has been shown to be useful in many applications.
Journal ArticleDOI
Stability of photovoltaic and wind turbine grid-connected inverters for a large set of grid impedance values
TL;DR: In this paper, the authors analyze the stability problems of grid connected inverters used in distributed generation and demonstrate that the use of active damping helps to stabilise the system in respect to many different kinds of resonances.
Proceedings ArticleDOI
Virtual flux based direct power control of three-phase PWM rectifiers
TL;DR: In this article, the authors proposed a direct power control (DPC) of three-phase pulsewidth-modulated rectifiers without line voltage sensors, which is based on virtual flux (VF) estimation.
Journal ArticleDOI
Multiple harmonics control for three-phase grid converter systems with the use of PI-RES current controller in a rotating frame
TL;DR: In this article, a hybrid system consisting of a proportional integral (PI) controller plus a generic hth harmonic resonant controller implemented in a frame rotating at the n th harmonic frequency is discussed in detail.